While not sedans, '67 Galaxie XL promos can be had pretty reasonably, the hoods are molded separately, and the chassis from '65 or '66 kits are correct for them - so they are a good basis for a model style build.
A builder on another forum got a pretty good start on a 1:25 Gigahorse, I stumbled upon it a few weeks back, but I can't find it now. An impressive 1:10 scale R/C build was spotted on Pinterest, however.
The kit firewall is detailed, but it's all 100% bogus "detailing" that doesn't even come close to resembling the real car. The only thing that does look sort of close is the heater blower motor, so I'd cut that off and add it to the resin firewall. With a master cylinder and power booster and the spring tower braces, it will look pretty good when done. -MJS
Think that's good? DPS used to be really sneaky in the '90s. They had a few mid-'90s Thunderbirds with tinted windows, metallic paint, wire wheel covers, and whitewall tires running up and down the 60. The speeders never stood a chance; when one of those came behind you and you saw the red and blue wig-wags behind the grille, you were pretty well hosed. They also had a few dark-colored Monte Carlos. People complained, as people do.